condition mean min max ZT0-3 24.066049999999997 24.066049999999997 24.066049999999997 ZT4-7 23.133499999999998 23.133499999999998 23.133499999999998 ZT8-11 18.2563 18.2563 18.2563 ZT12-15 12.973500000000001 12.973500000000001 12.973500000000001 ZT16-19 24.4446 24.4446 24.4446 ZT20-23 23.720950000000002 23.720950000000002 23.720950000000002